What is the advantage of reproducing through spores?

The process of spore formation takes place in many simple multicellular organisms which have certain reproductive parts that can be identified.
$(a)$ Name the organism using this process.
$(b)$ Name the reproductive and non-reproductive parts of such organisms.

In the process of grafting,what is the part of the plant that possesses the root system called?

In the process of grafting,what is the name given to the part of the plant that is attached to the cut stem of another plant?

Organisms have a varied body design. Name the property which gives the basic difference in body design.

Which unicellular organism reproduces by budding?